right-hand 0.480" thread length headless (setscrew) head style 16 thread quantity per inch 0.6683 in. max minor dia of thd; 0.031 in. radius by 0.580 in. dia relief between thd phosphate surface treated uns thread series
3a thread class right-hand 0.500" thread length headless (setscrew) head style 18 thread quantity per inch navy special project keyway on od 0.031 in. deep by 0.031 in. w unc thread series
3a thread class right-hand 0.875" thread length headless (setscrew) head style 20 thread quantity per inch hole countersunk 90 deg to 0.750 in dia oxide surface treated unc thread series
